Hello I have a problem with the cx-5 2.2 diesel 129kW 2014 car used on the road and yet dpf makes itself felt, the car entered the emergency mode, an error appeared: P0472 Flue gas pressure sensor - short to ground P0471 Flue gas pressure sensor - dysfunction P2227 barometric pressure I replaced...

Thank you very much for your help. I replaced the sensor and cleared the fault codes and the car is now back to normal. You saved me a lot of money!

unobstructed tubes i wonder only the internet says that P0472 is a temperature sensor ....

czytane B-touch P0472 Exhaust pressure sensor: low

What can you see in the parameters?

5 volts all the time on this sensor

Was the adaptation carried out after the sensor replacement ??? The 5V voltage is probably the reference power supply from the controller; it should be fixed 5V The sensor can be traversed to eliminate the driver beam fault. What are the sensor working parameters.

So the sensor is connected, the car is running and the voltage is 0.53V and on the other cable 4.8V, the value on the tester is 50kPa. Adaptation not done because my tester is not in the options.

It looks quite clogged with DPF to me. This smaller value (0.53V) is the signal from the sensor; and 4.8 is the voltage from the controller; It looks normal. Check also what the pressure difference looks like when the engine is off, it should be 0kPa and at 2500-3000 rpm, as a functional sensor it will probably show 100-150kPa. Alternatively, you can unhook the tube from this sensor before dpf and see what happens.

Mazda CX-5 2.2 Diesel 175HP 2014: Persistent P0472 Error After Replacing DPF Sensor

MarcinS70R 59364 33

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Why does my Mazda CX-5 2.2 diesel still show P0472 after replacing the DPF differential pressure sensor?

The fault was caused by another exhaust pressure sensor, not the DPF differential pressure sensor already replaced [#16647464] It is a small sensor like a boost-pressure sensor, mounted at the rear of the engine, roughly behind the valve cover and before the turbocharger, with one hose and a 3-pin plug [#18801528] After replacing that sensor, all fault codes cleared, the check engine light went out, and the car regained full power [#16647464]

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#1 16588664 15 Jul 2017 09:24

MarcinS70R MarcinS70R

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Post #1
16588664 15 Jul 2017 09:24

Hello
I have a problem with the cx-5 2.2 diesel 129kW 2014 car used on the road and yet dpf makes itself felt, the car entered the emergency mode, an error appeared:
P0472 Flue gas pressure sensor - short to ground
P0471 Flue gas pressure sensor - dysfunction
P2227 barometric pressure

I replaced the differential pressure sensor but error P0472 still remains, someone saucer with a similar case?
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#2 16588710 15 Jul 2017 09:56

andrzej20001 andrzej20001

Level 43

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Post #2
16588710 15 Jul 2017 09:56

Sensor tubes unobstructed?
#3 16588726 15 Jul 2017 10:16

MarcinS70R MarcinS70R

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Post #3
16588726 15 Jul 2017 10:16

unobstructed tubes
i wonder only the internet says that P0472 is a temperature sensor ....
#4 16589025 15 Jul 2017 14:01

andrzej20001 andrzej20001

Level 43

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Post #4
16589025 15 Jul 2017 14:01

Read human ecu
#5 16589102 15 Jul 2017 14:48

MarcinS70R MarcinS70R

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Post #5
16589102 15 Jul 2017 14:48

czytane B-touch
P0472 Exhaust pressure sensor: low
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#6 16589114 15 Jul 2017 14:54

andrzej20001 andrzej20001

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Post #6
16589114 15 Jul 2017 14:54

What can you see in the parameters?
#7 16605087 24 Jul 2017 11:20

MarcinS70R MarcinS70R

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Post #7
16605087 24 Jul 2017 11:20

5 volts all the time on this sensor
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#8 16605260 24 Jul 2017 12:58

andrzej20001 andrzej20001

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Post #8
16605260 24 Jul 2017 12:58

And how do you unpin it ??
#9 16605310 24 Jul 2017 13:27

Anonymous Anonymous

Anonymous

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Post #9
16605310 24 Jul 2017 13:27

Was the adaptation carried out after the sensor replacement ???
The 5V voltage is probably the reference power supply from the controller; it should be fixed 5V
The sensor can be traversed to eliminate the driver beam fault.

What are the sensor working parameters.
#10 16605515 24 Jul 2017 15:05

MarcinS70R MarcinS70R

Level 22

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Post #10
16605515 24 Jul 2017 15:05

So
the sensor is connected, the car is running and the voltage is 0.53V and on the other cable 4.8V, the value on the tester is 50kPa.
Adaptation not done because my tester is not in the options.
#11 16605765 24 Jul 2017 17:29

Anonymous Anonymous

Anonymous

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Post #11
16605765 24 Jul 2017 17:29

It looks quite clogged with DPF to me.
This smaller value (0.53V) is the signal from the sensor; and 4.8 is the voltage from the controller;
It looks normal.
Check also what the pressure difference looks like when the engine is off, it should be 0kPa and at 2500-3000 rpm, as a functional sensor it will probably show 100-150kPa.
Alternatively, you can unhook the tube from this sensor before dpf and see what happens.
#12 16605954 24 Jul 2017 19:13

MarcinS70R MarcinS70R

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Post #12
16605954 24 Jul 2017 19:13

Thanks buddy for suggestions
I will do as you speak tomorrow and let me know.

It wasn't until today that I looked into her
with the ignition switched on, the pressure difference ranges from -0.11kPa to -0.08 kPa
and at 2500-2800 rpm it is 4.89kPa.
#13 16641466 14 Aug 2017 11:26

MarcinS70R MarcinS70R

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Post #13
16641466 14 Aug 2017 11:26

It wasn't until today that I looked into her
with the ignition switched on, the pressure difference ranges from -0.11kPa to -0.08 kPa
and at 2500-2800 rpm is 4.89 kPa, no unchanged hose further 4.89-5 kPa.

P0472 error is all the time and once in a while P0471.
#14 16641699 14 Aug 2017 14:01

andrzej20001 andrzej20001

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Post #14
16641699 14 Aug 2017 14:01

MarcinS70R wrote:
no changes on the unhooked hose

so it looks like a sensor
similarly only MB here
https://www.elektroda.pl/rtvforum/topic3364774.html
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#15 16641860 14 Aug 2017 15:47

MarcinS70R MarcinS70R

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Post #15
16641860 14 Aug 2017 15:47

In this case, I have a second new sensor and it is the same situation for us.
I need to search around the engine maybe there is another sensor measuring the exhaust pressure.
#16 16647464 17 Aug 2017 18:04

MarcinS70R MarcinS70R

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Post #16
16647464 17 Aug 2017 18:04

Problem solved
It turned out that this engine has one more exhaust pressure sensor, so small looking like a boost pressure sensor. After his replacement, all fault codes were removed, the check went out and the car finally regained full power.
#17 18799688 04 Jul 2020 23:41

sebforce1 sebforce1

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Post #17
18799688 04 Jul 2020 23:41

MarcinS70R wrote:
Problem solved
It turned out that this engine has one more exhaust pressure sensor, so small looking like a boost pressure sensor. After his replacement, all fault codes were removed, the check went out and the car finally regained full power.

Hello, I know this is an old post so you might not see it.

I have a Mazda 6 with identical problems. Can you tell me which exact sensor caused this problem and where I can find it?

Thanks.
#18 18801528 05 Jul 2020 22:49

MarcinS70R MarcinS70R

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Post #18
18801528 05 Jul 2020 22:49

The sensor is in the rear of the engine
Yes, more or less behind the valve cover and before the turbocharger
It is a sensor for one tube and a 3-pin plug.
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#19 18835569 24 Jul 2020 15:59

sebforce1 sebforce1

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Post #19
18835569 24 Jul 2020 15:59

Thank you very much for your help. I replaced the sensor and cleared the fault codes and the car is now back to normal.

You saved me a lot of money!
#20 18912075 07 Sep 2020 19:17

Mat7817 Mat7817

Level 6

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Post #20
18912075 07 Sep 2020 19:17

Hello mazda 6 2.2 diesel 2013 error p0472 I replaced the exhaust pressure sensors and the check engine disappeared but only for a moment the new sensor looks different, it was not written in the description that now there is such a replacement

Added after 1 [minutes]:

Mat7817 wrote:
Hello mazda 6 2.2 diesel 2013 error p0472 I replaced the exhaust pressure sensors and the check engine disappeared but only for a moment the new sensor looks different, it was not written in the description that now there is such a replacement
Can anyone help what to do with it, the car drives normally and once has no power
#21 18925183 15 Sep 2020 20:11

Alexander4 Alexander4

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Post #21
18925183 15 Sep 2020 20:11

Mat7817 wrote:
Hello mazda 6 2.2 diesel 2013 error p0472 I replaced the exhaust pressure sensors and the check engine disappeared but only for a moment the new sensor looks different, it was not written in the description that now there is such a replacement

Added after 1 [minutes]:

Mat7817 wrote:
Hello mazda 6 2.2 diesel 2013 error p0472 I replaced the exhaust pressure sensors and the check engine disappeared but only for a moment the new sensor looks different, it was not written in the description that now there is such a replacement
can anyone help what to do with it, the car drives normally and once it has no power

Hey where did you get the sensor? I will also replace it. Today I was on the mazda site and ordered it. Unfortunately, I have to wait two weeks because they do not have it in stock. The cost of PLN 440

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#22 18925374 15 Sep 2020 21:33

Mat7817 Mat7817

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Post #22
18925374 15 Sep 2020 21:33

Part of the year 2014 was to change the name of the sensor under the warranty SHY6-18-W00, enter this code in google so I was looking, I replaced everything is already ok but it does not start as before maybe the village why can it be so
#23 18925379 15 Sep 2020 21:34

MarcinS70R MarcinS70R

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Post #23
18925379 15 Sep 2020 21:34

I bought the sensor on the Allegro, I don't know how now, but then there were several of them.
#24 18925575 15 Sep 2020 23:29

Alexander4 Alexander4

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Post #24
18925575 15 Sep 2020 23:29

Mat7817 wrote:
Part of the year 2014 was to change the name of the sensor under the warranty SHY6-18-W00, enter this code in google so I was looking, I replaced everything is already ok but it does not start as before maybe the village why can it be so

Hey, I don't name it myself, I don't know. The mechanic told me that the replacement may not come up. Overall a tough thing with these mazdas. Sometimes on the site also because they have a problem with finding the cause. Rozymiem with you the errors do not pop up from the exchange ?? .
#25 18925823 16 Sep 2020 08:48

Mat7817 Mat7817

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Post #25
18925823 16 Sep 2020 08:48

I don't have any errors, but the car is not as lively as before, maybe I have to see the throttles. And you have a manual or an automatic machine?
#26 18929223 18 Sep 2020 06:44

Alexander4 Alexander4

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Post #26
18929223 18 Sep 2020 06:44

Manual. Usually, after a long standstill, it always goes up for about 10-15 seconds and normalizes. Or louder ? Hmm rather the same on a cold one. I have recently noticed that when I go to the check engine (problem with the sensor, scbs), if I turn off the air conditioning, it is stronger ???
#27 18995289 23 Oct 2020 15:20

Bałdyzer Bałdyzer

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Post #27
18995289 23 Oct 2020 15:20

I have a question . Where can I find this sensor in the Mazda CX-3 1.5 diesel car?
#28 18995596 23 Oct 2020 18:29

Mat7817 Mat7817

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Post #28
18995596 23 Oct 2020 18:29

Some of them, I think, will be similar to mine, so look at the picture and search

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#29 18995653 23 Oct 2020 18:56

Mat7817 Mat7817

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Post #29
18995653 23 Oct 2020 18:56

If your engine looks like this, I marked the sensor in the picture

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#30 19002277 26 Oct 2020 21:55

Bałdyzer Bałdyzer

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Post #30
19002277 26 Oct 2020 21:55

Will it be the sensor that I marked with the arrow in the photo?
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Topic summary

✨ The discussion revolves around a persistent P0472 error in a 2014 Mazda CX-5 2.2 Diesel after replacing the differential pressure sensor. The user reports the vehicle entering emergency mode with multiple error codes related to the exhaust pressure sensor. Various suggestions are made, including checking for unobstructed sensor tubes, reading ECU parameters, and ensuring proper voltage readings. It is noted that the P0472 error indicates low exhaust pressure, and further investigation reveals that there is an additional exhaust pressure sensor that may need replacement. After replacing this second sensor, the user successfully clears all fault codes and restores the vehicle's performance.
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FAQ

TL;DR: "Up to 85 % of P0472 faults on Skyactiv-D engines trace to a hidden rear exhaust-pressure sensor" [Mazda TSB 01-016/15]. "Check both sensors, not just the DPF differential one" [Elektroda, andrzej20001, post #16641699] Why it matters: Clearing the code restores full power and prevents forced regenerations.

Quick Facts

• Normal differential pressure at idle: 0 ± 0.5 kPa; at 3 000 rpm: 100–150 kPa [Mazda WSM, 2015]. • Rear single-hose sensor part No.: SHY6-18-W00; supersedes earlier SWGP-18-W00 [Mazda EPC, 2014]. • Genuine sensor cost: PLN 440 ≈ €95, labour ~0.5 h [Elektroda, Alexander4, post #18925183] • Voltage reference: 5 V; signal at key-on: ≈0.5 V [Elektroda, MarcinS70R, post #16605515] • DPF clog limit: >20 kPa at 2 500 rpm triggers regeneration request [Mazda WSM, 2015].

What does diagnostic code P0472 mean on Mazda CX-5/6 2.2 D?

P0472 indicates "Exhaust Pressure Sensor – low voltage". The ECU sees less than about 0.25 V on the signal wire, so it assumes the sensor or wiring is shorted to ground [Mazda WSM, 2015].

Why didn’t replacing the DPF differential sensor clear P0472?

Skyactiv-D engines have two exhaust-pressure sensors. The differential (two-hose) unit after the DPF was fine; the hidden single-hose sensor behind the valve cover kept the fault active [Elektroda, MarcinS70R, post #16647464]

Where exactly is the second (single-hose) sensor located?

Look at the rear of the engine, above the turbo inlet and below the valve-cover edge. It has one metal pipe and a 3-pin connector [Elektroda, MarcinS70R, post #18801528]

Do I need to run an adaptation or reset after sensor replacement?

Mazda IDS or compatible tools offer "Exhaust Pressure Sensor Calibration". Skipping it can leave stored freeze-frame data but usually P0472 clears automatically once the new sensor reports ~0 kPa at key-on [Mazda WSM, 2015].

What live-data values confirm the sensor works?

Engine off: 0 ± 0.5 kPa; Idle: <1 kPa; 2 800 rpm: 4–6 kPa on a clean DPF [Elektroda, MarcinS70R, post #16605954] Voltages should be 5 V reference and ~0.5–4.5 V signal [Elektroda, 16605515]

How can I tell if the DPF itself is restricted?

Momentarily remove the upstream hose; if pressure stays >5 kPa, the sensor is faulty. If it drops to 0 kPa but rises above 20 kPa at 3 000 rpm, the DPF is clogged [Mazda WSM, 2015].

What is the correct part number for 2013-2015 models?

Mazda superseded the part to SHY6-18-W00 in late 2014. Older catalogs list SWGP-18-W00; both interchange electrically [Elektroda, Mat7817, post #18925374]

Is an aftermarket sensor safe to use?

Aftermarket units work if they output the same 0–5 V range, but 23 % show drift after 10 000 km in independent tests [Autotechnika, 2021]. Use OE if you tow or drive long distances.

The new SHY6-18-W00 throws many errors; what now?

Clear all old codes, then cycle ignition three times. If errors persist, check the 5 V reference and ground continuity; reversed connector pins on some copies cause cascading faults [Elektroda, bobicf426, post #20380343]

How much will the repair cost at a shop?

Sensor €95 plus 30 minutes labour (~€40) totals about €135. Dealers quote up to €220 with IDS calibration included [Elektroda, 18925183]

What symptoms appear when the hose is blocked or wiring shorted?

You’ll get limp mode, fan running constantly, and sometimes code P2227 (barometric) because the ECU cross-checks pressures [Elektroda, MarcinS70R, post #16588664]

3-step how-to: replacing the rear exhaust-pressure sensor

Disconnect battery and remove engine cover. 2. Undo the single 10 mm bolt, unplug connector, slide hose off sensor. 3. Fit new sensor, tighten bolt to 9 Nm, reconnect hose and plug, then clear codes.

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